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[Cob] How warm must it be to work?Shannon C. Dealy dealy at deatech.com
Mon Oct 25 14:31:24 PDT 2004
On Mon, 25 Oct 2004, Amanda Peck wrote: [snip] > types are much nicer, both for the cats and for me--but it doesn't separate > into slip if the bottom layers stay in liquid too long. So I'd guess it > either has some gypsum in it, or else is a very low-fired clay. [snip] Bentonite is rather different from most clays that people work with because it absorbs and holds far more water (which is why it is used for cat litter), and it is sometimes used as a sealant. If you put bentonite in a bucket, add water and let it sit, the top of the clay will seal the water out of the bottom of it (the moisture will seep in, but very slowly) and form a very solid plug at the bottom of your bucket making it very difficult to mix. To make a clay slip, you normally mix water and clay, but the clay (any clay) will eventually settle out (hours, days, weeks, or even months depending on the clay), you have to mix it up to get it back into suspension, bentonite is generally alot harder to mix once it is out of suspension. I usually measure the water first, then add the clay slowly while mixing to prevent this problem. To give you an idea of how absorbent it is, one pint of bentonite can soak up roughly a gallon of water. Shannon C. Dealy | DeaTech Research Inc. dealy at deatech.com | - Custom Software Development - | Embedded Systems, Real-time, Device Drivers Phone: (800) 467-5820 | Networking, Scientific & Engineering Applications or: (541) 929-4089 | www.deatech.com
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